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Ted Yu created FLINK-9736:
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             Summary: Potential null reference in KeyGroupPartitionedPriorityQueue#poll()
                 Key: FLINK-9736
                 URL: https://issues.apache.org/jira/browse/FLINK-9736
             Project: Flink
          Issue Type: Bug
            Reporter: Ted Yu


{code}
    final PQ headList = heapOfkeyGroupedHeaps.peek();
    final T head = headList.poll();
{code}
{{peek}} call may return null.
The return value should be checked before de-referencing.



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